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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a08021a337f9507bb72d3f7f1af85d3701fc1f4a33d089923ca79010ce5f50' 
  AND token = 'oPep239ZQVE4VMRn18abUuPygnyXXMZAua/L/4/561Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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