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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c04655483a856c0278bec3d578d286a25a27508a2412850093c1115f84cb935' 
  AND token = '7B0k2zA2oMoQxX14jnkOX0ODhKHq26dbucAnsFxKp7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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