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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e4c14df3f747320e461528379d367a3ba3be7ae59372493a4dd596912e734a' 
  AND token = 'RKG0qfsH3HS1tiro/wnBFQKLNB10L4nG2FpAHHQiinY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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