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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624acdb48b6bec9fc75a53c81e16334e613bb1cdb843f3931f483c06cf10c7bf' 
  AND token = 'FJ088MMmnUya4J2AAQrxvCmAV1HNJvbzV3ZGfF8s+ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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