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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cdf7d4d94b2a808b0fe3890eb5a42edf1f46f4e4dd6a1f17b99368cb094455' 
  AND token = 'kMeKKczrBDSdfWlLRDXO86YW/N9Ept0TSZYr+PWKOA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}