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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6029d6cf949bf4fb409f77919ba7f5fadd5be472c12ad87413e8ecc1f30e424d' 
  AND token = 'wo3IuQi9U/uevQ3yFAG4dZLrN1u3I2o9UO6hmUVOyzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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