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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797465b68344fded179b3e10e95f27b1415e2f6c9fac1e8ee9039ee51bfc2b8b' 
  AND token = 'KXEFBJiGE7VpyjeOU4uvUe7FbMh/rzKnE1bBrY0NntY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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