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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb250d5b2950ce2e79f6bc2e7cc016298eae54e62d4d1b080ab881d6fd3d7ac' 
  AND token = '7m8Hm4Qvam1c3F08ejlwlTfIDBqSxn8ec4Vmr5i5Sto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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