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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5ba662ad9d4c2b0d3bf89062cff533b6873983a0c78caf6d0e8a449f6a65db' 
  AND token = 'hyD2l1PdaieXPKInpLdVHMtcRyCEnvnousLZj8z9/NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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