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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69def671a561d47f30e8ba1cd8ec2db4a44969e13b172b31a7427eff09ea308' 
  AND token = 'AJXVhOyoP9BPzGqlebetFG2ajjTblo1vL+7co6CXIu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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