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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14037e31cdb2e04ebb414eadabc5237d1cd4e2eb5eb2a6026a1403e8f558327f' 
  AND token = 'rjhYcZI7omFUJHz5gUFlynbv83k1nbTsLQ9LuS+u/Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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