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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0dd52dbcd6373ad3cdb7f2a33d22d5409eb8cca4592f584d79bdeb532fe66ff' 
  AND token = 'iVrQorlXOqmNhEh8kcWeCt0tb/WtqkjzVMdymL8JKAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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