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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c737f37aa09ad1b612c0ef57c97ce32fc675e59c50ed6b7fcfa47df928509e1a' 
  AND token = 'HDz437S9BNXBwiHKVU6YelestVRYvIpZVPMLITKi8xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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