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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d986b719225990216fc68117c60641ee9850a0c4e9aaa5a3614feffe74715a' 
  AND token = 'utFOqaaMZzsa0RM27r8gRlIYEipf1+Oq810azzUVRNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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