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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630460d3b1afeba6e480d3a0fc146f92ed0881878035dd3475e31b2776e986bf' 
  AND token = 'FFTJeQ4T+rbjSyxXKeXU5ajvMcEjX0oTuu0/GvomZOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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