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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fdf29739e71bd30cd0c20ff03bf0ad4d3c01e02e95aad01a9fc8eb555bec85' 
  AND token = 'mZ/HV8ZPNN0FsOP9NIk6ElPZ2l2loPFgS090wxTKyOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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