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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41def3f2a1de846d792d1d8a5216b42f27ccb09bf3aac8cc57c9d949ba26c1d' 
  AND token = 'PZAhHjfc4+xudaOBe03kud6bXNclb4MzUQouMLqDHcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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