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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5032eb5472484ca2d9c61d507ca3885815d3be76ee5ad757c33ea0bdb9a3a2a0' 
  AND token = 'Nc9qGTS++++t7AJAOLRtga5pSvVyPLhCWCEAsKbSnKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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