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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ca59ce6f8578b31c28c5a2f0efa0867daece0c64408904e6a7e7e289205ad' 
  AND token = 'Uuz6eqgrOlonQU79oBRxy81k6CH9AA/nvXotSw4ypYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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