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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bc474c41dffe75d210967d50b940cde2c8da7251f8f2bb1e5d9d087ef83189' 
  AND token = '3FXagK7NeUymW4rb/bDsyWNxC/vFqTWnLM+rLE2jICo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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