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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc4b781f62b871eee205ca263382ae4434ba98e0fecf6a433ea1a7324ff911a' 
  AND token = '8EQ4REwBC5YrF/3PSA+Vy8dPVW9Y+fAOdEs0Gg6cDi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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