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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63dcbe875c32c2354552082cc4a1b3419d5f26e25e3ddb23685ddec1e25de94' 
  AND token = 'H/i7X/MKyVQ3/R+1FZq6N8D3Z0uUhAvB6ZASi1zRAIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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