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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7f8848a43a40e7740126ef61b47ff2c0f1f37f0a58504bef98f0e6f7a74f98' 
  AND token = '4Sttpqlu97kAiKbTIxAwEOnyluupbajqgNgPTjAheUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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