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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1949e5e93ce5849e2a400674e85b7855cd6e390a61aec2d6761b51f6daf10783' 
  AND token = 'zij0JNx9a2sM+oxGxf5iSkBnAv5PBnaaCw13QyhEgpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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