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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8fddf23d25e34737692e2bf1d9896605a68cecb888755df6f68d9ffe7f5fcb' 
  AND token = '2fDNrA6YXFDGPMuQxfiL6F3YDJRp7voJhsFOIcB6jts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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