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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec24738fd53deb0cc6d5d157bc6cbd2992d5f148c56bdc9b39f30da455602a8' 
  AND token = 'EkrHpm1w6pW193380pHO1pUmdbCbmHA7nLVZb1RHC2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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