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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c20f0959ec5e861586b231a7501a28565fa68bc51feb7480ff2efae60792fe1' 
  AND token = 'z4og/jbbCQi0qcR3eos+cAVyEunJvA5RouG6IDG1dt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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