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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42190c7752a38628a05dfecd0e02e1d5b5dd8f5384f31311df3cf053202b607c' 
  AND token = 'FmVDwOYVoci08jm4OqeiJog0R8k+3NybfC2oXayIBdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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