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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b8207f7c3b66352a42388f6f75038d766f35aa8ad58cec3c676eaa2b54af4e' 
  AND token = 'W56taBkPDrblZqVUeb9QfbAJIGbbcP4/30JjdVkc6aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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