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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c91482bbb5f4f6931b7c826ab6b9bd7a0d476fec9c3628594f33b930e7a1fd' 
  AND token = 'qg8X3ZUqtq4JPhO16bxdmCcw2ZDrXmgoJipa+TeRR2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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