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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be13e1a3c84783795093d85c510a14a9122171fa39b85f2eca2c3550ce4473c' 
  AND token = 'T042OacJUPyuafxjeZpe5Laz8jI1VoZiAcJbsMcSVeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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