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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b981911d2b785ae72bc9a070c363494adbc43b7f49309e4fc7bc1cf66dbae06f' 
  AND token = '2NQXNoICip23sLxKh6eLeEcoioDDnIZK7vPKIpiuvA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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