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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c61941a613d25df1c4b2fc5af63101518be2cd52b4bd319d361a87f8f4e1356' 
  AND token = 'dflqGLrd64S0V2uJkhXnFV7xS/9aqtRP86Of1n8CS4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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