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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f7b834a00a5140dba9d0cfb03ece57fbc663f0d3eb758869dd66ec14174cef' 
  AND token = 'lPAhM+c8qfOvv7RLXP/s3DzQ5gDeSEmrZvh4zeqzx+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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