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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ab2041ef3d814f1f73540c8dd4aecfd0bda530d1ff0f98c99eece2c93f24f0' 
  AND token = 'kZHPA+52I2tO+dIXF0I+XRjttyIxzjShddFHcZrYfSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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