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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee4a62d2fda09538c90df7e734d46b59e6311536d6f74cf6d8a1af42f7e91d3' 
  AND token = 'beBaZ4INDLFLezIxRv+bwcyrmHG+W6SM3BPQYkqFQdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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