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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e14ff72c6a18f8247ff03ae42320ae1d36681468f809fa9de23ec5f29ee00e' 
  AND token = '+K8dsggNJkm/C6GGxCUafbeWLZGFXaGknGG6e0y0xNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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