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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746fdd06a74480a5b54070b5e4278d78fcf140ea579b7025bbbf5b5f5823b6c6' 
  AND token = '9b7UI33GN1TADRBIjofwTcU8UA2wfaeyDxIjafoyiwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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