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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae6df91e6e7aec2f530931a6f75e5551e0b316c181c8d879f4a88d3dfeed84b' 
  AND token = 'JTKaeFQ2heuV4YzUyen+PJA+E8Mby+zYyjdF57OGuK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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