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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a614604fe7a458d2286c787881c17385d42f6abf572097f92ff70040f7448eab' 
  AND token = 'vsUD4ekcyqH+3338Np53J993WO8hChW6ulMdv80/ZHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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