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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432d4984f9ea792d1dc5412ac98096307a8f3b232d4cc833808a98c9f8c28f17' 
  AND token = 'oKXw8SEiUJmZ+KVV82daem41rFVHIBdA3YeiGtaAONE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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