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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6e7eea3a21c80ee6f8ecd87494b4a0b54e8a8651dcb82d96894695da30b4f5' 
  AND token = 'F8va1f21X5Ba0BWgPhZwtd7LGPfUgChzMuacs5uMGGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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