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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770e64c2ce4074720f1b3118cc8419ef21ff0a5fe65dbb7ba349935e63225302' 
  AND token = 'pmiImMKgi2HcpkWxeWtpkhoE75XcrXa1JLO/y0noc1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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