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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122735056a62627f20a418e2c99de05d38f70591e1319b1a7da288a96612fdeb' 
  AND token = '5Mfvqid8r3gfa6W83SrmMu1u4ZyCkQXAW7vdaAeSQTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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