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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdc8fce9060ad6397eff2148768b4851e575d2b7576f5ee57df185acf164dda' 
  AND token = 'eKhREGQNCOL38UaB1QctsUcymSY4SaGK4q6tJPBgGck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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