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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0d934fa67deabe4b3750efa8940eff36231d4ce3e47d7cdec41e0bf56fe73e' 
  AND token = 'xsE9S1fS/r87luC1EzFhTptnjiWkQCetbn49ICDRE44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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