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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51be867770380e73e01b01f5778bc0552f83393c634eee1b6703dd472fab9c0b' 
  AND token = 'oZpiwT7hXDs3erAOt+Yug8T4QoCaKuUFtOUmQFeY5NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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