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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f639d2a0e632f60aa513d2409f44049cd82f4a2083cede0c7a4fbd9287c9bce5' 
  AND token = 'quMoiR0L3e0VJeRDKIq/i2k2h6h40topCI6HSYkhapo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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