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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26466c5651c0968940318cba219b92867515bb33f09191154cd291e4354a2e3a' 
  AND token = 'ix5ewrPW0QckYR6sTldofDiW4VuJgF55h8f8TxRpYqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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