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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b864eb32904cea38e54525d4190a7299eb441d01da8af072fcdd815cd576f62' 
  AND token = '8LCwJ3P25H1D7Qxio5Z4vPu0cf9bKSOdxodfxyCCMmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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